Xpander VCF

[Martin Czech]

What I wanted to say is that you can't simulate closed loop behaviour
in time domain near oscillation. 

I think one criterium to be able to integrate via Newton/Raphson 
or other methods is stability of the system.

I know no simulator that is able to do this.  So you
have to do it open loop.

m.c.



:::From: jhaible at t-online.de (jh.)
:::To: "Martin Czech" <czech at Micronas.Com>
:::Cc: <synth-diy at node12b53.a2000.nl>
:::Subject: Re: Xpander VCF
:::Date: Fri, 27 Oct 2000 13:31:21 +0200
:::X-Sender: 320011350262-0001 at t-dialin.net
:::
:::
:::> Open loop transfer function and stability criteria a la Bode?
:::
:::Or whatever it is called. Phase margin, one dominant pole ...
:::I'd say the capacitor must be big enough that even with the
:::highest bias current (highest cutoff frequency for the other
:::stages) the "disabled" stage's pole formed by the external cap
:::and the bias current must still dominate over all the other parasitic
:::poles.
:::
:::JH.
:::